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ABB semaphore protection overhaul The ABB semaphone protection logic that came with TCS211 from TI was broken in several ways: * Some semaphore-protected functions were called from Application_Initialize() context. NU_Obtain_Semaphore() called with NU_SUSPEND fails with NU_INVALID_SUSPEND in this context, but the return value wasn't checked, and NU_Release_Semaphore() would be called unconditionally at the end. The latter call would increment the semaphore count past 1, making the semaphore no longer binary and thus no longer effective for resource protection. The fix is to check the return value from NU_Obtain_Semaphore() and skip the NU_Release_Semaphore() call if the semaphore wasn't properly obtained. * Some SPI hardware manipulation was being done before entering the semaphore- protected critical section. The fix is to reorder the code: first obtain the semaphore, then do everything else. * In the corner case of L1/DSP recovery, l1_abb_power_on() would call some non-semaphore-protected ABB & SPI init functions. The fix is to skip those calls in the case of recovery. * A few additional corner cases existed, all of which are fixed by making ABB semaphore protection 100% consistent for all ABB functions and code paths. There is still one remaining problem of priority inversion: suppose a low- priority task calls an ABB function, and some medium-priority task just happens to preempt right in the middle of that semaphore-protected ABB operation. Then the high-priority SPI task is locked out for a non-deterministic time until that medium-priority task finishes its work and goes back to sleep. This priority inversion problem remains outstanding for now.
author Mychaela Falconia <falcon@freecalypso.org>
date Mon, 26 Apr 2021 20:55:25 +0000
parents 35f7a1dc9f7d
children
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;********************************************************************************
;*** File           : llgmm.pdf
;*** Creation       : Wed Mar 11 09:58:16 CST 2009
;*** XSLT Processor : Apache Software Foundation / http://xml.apache.org/xalan-j / supports XSLT-Ver: 1
;*** Copyright      : (c) Texas Instruments AG, Berlin Germany 2002
;********************************************************************************
;*** Document Type  : Service Access Point Specification
;*** Document Name  : llgmm
;*** Document No.   : 8441.103.99.014
;*** Document Date  : 2003-03-21
;*** Document Status: BEING_PROCESSED
;*** Document Author: ANS
;********************************************************************************



PRAGMA 	SRC_FILE_TIME 	"Thu Nov 29 09:44:54 2007"
PRAGMA 	LAST_MODIFIED 	"2003-03-21"
PRAGMA 	ID_AND_VERSION 	"8441.103.99.014"



CONST 	LLGMM_MAX_SEQ_NR 	511 	; maximum sequence number value
CONST 	LLGMM_NUM_SAPIS 	16 	; number of SAPIs (not all are available)
CONST 	LLGMM_TLLI_INVALID 	0xFFFFFFFF 	; invalid TLLI value



VALTAB 	VAL_ciphering_algorithm
VAL 	0 	LLGMM_CIPHER_NO_ALGORITHM 	"no ciphering algorithm"
VAL 	1 	LLGMM_CIPHER_GPRS_A5_1 	"GPRS A5/1 ciphering algorithm"
VAL 	2 	LLGMM_CIPHER_GPRS_A5_2 	"GPRS A5/2 ciphering algorithm"
VAL 	255 	LLGMM_CIPHER_NA 	"value n/a"

VALTAB 	VAL_trigger_cause
VAL 	1 	LLGMM_TRICS_PAGE_RESPONSE 	"trigger was sent due to a received paging message"
VAL 	3 	LLGMM_TRICS_CELL_UPDATE 	"trigger was sent because of a cell update"
VAL 	4 	LLGMM_TRICS_CELL_UPDATE_NULL_FRAME 	%REL99% 	"LLC can use NULL frame for cell updates"

VALTAB 	VAL_error_cause
VAL 	0 - 99 	"reserved for GRR error causes"
VAL 	DEF 	 	"invalid error cause"
VAL 	0b1101000001100100 	LLGMM_ERRCS_INVALID_UA 	"invalid UA response"
VAL 	0b1101000001100101 	LLGMM_ERRCS_SABM_INVALID_XID 	"invalid XID response during connection establishment"
VAL 	0b1101000001100110 	LLGMM_ERRCS_SABM_NO_PEER_RES 	"no peer response during connection establishment"
VAL 	0b1101000001100111 	LLGMM_ERRCS_XID_INVALID_XID 	"invalid XID response during parameter negotiation"
VAL 	0b1101000001101000 	LLGMM_ERRCS_XID_NO_PEER_RES 	"no peer response during parameter negotiation"
VAL 	0b1101000001101001 	LLGMM_ERRCS_DISC_NO_PEER_RES 	"no peer response during release of connection"
VAL 	0b1101000001101010 	LLGMM_ERRCS_MULT_ASS_TLLI 	"possible multiple assignment of a TLLI value"
VAL 	0b1101000001101011 	LLGMM_ERRCS_DM1_RECEIVED 	"unsolicited DM response with F bit 1 in state ABM"
VAL 	0b1101000001101100 	LLGMM_ERRCS_DM1_RECEIVED_REEST 	"unsolicited DM response with F bit 1 in state Timer Recovery; re-establishment procedure initiated"
VAL 	0b1101000001101101 	LLGMM_ERRCS_ACK_NO_PEER_RES_REEST 	"no peer response during waiting for acknowledgement; re-establishment procedure initiated"
VAL 	0b1101000001101110 	LLGMM_ERRCS_PEER_BUSY_REEST 	"peer receiver busy condition; re-establishment procedure initiated"
VAL 	0b1101000001101111 	LLGMM_ERRCS_FRMR_COND 	"frame rejection condition; frame discarded"
VAL 	0b1101000001110000 	LLGMM_ERRCS_FRMR_COND_REEST 	"frame rejection condition; re-establishment procedure initiated"
VAL 	0b1101000001110001 	LLGMM_ERRCS_FRMR_RECEIVED 	"FRMR response received; frame discarded"
VAL 	0b1101000001110010 	LLGMM_ERRCS_L3_REEST 	"layer 3 initiated re-establishment procedure"
VAL 	0b1101000001110011 	LLGMM_ERRCS_PEER_REEST 	"peer initiated re-establishment procedure"
VAL 	0b1101000001110100 	LLGMM_ERRCS_DM0_RECEIVED_REEST 	"unsolicited DM response with F bit 0; re-establishment procedure initiated"

VALTAB 	VAL_susp_cause
VAL 	DEF 	 	"suspension because of Attach or RAU"
VAL 	0 	LLGMM_RAU 	"suspension because of Attach or RAU, GRR has to be suspended"
VAL 	1 	LLGMM_CALL 	"suspension because of GSM establishment request"
VAL 	2 	LLGMM_LIMITED 	"suspension because of limited service"
VAL 	3 	LLGMM_PERIODIC_RAU 	"suspension because of periodic RAU"
VAL 	4 	LLGMM_NO_GPRS_SERVICE 	"suspension because of no service or no GPRS supported"




VAR 	old_tlli 	"old temporary logical link identifier" 	L


VAR 	new_tlli 	"new temporary logical link identifier" 	L


VAR 	key 	"ciphering key content" 	B


VAR 	ciphering_algorithm 	"ciphering algorithm" 	B

VAL 	@p_llgmm - VAL_ciphering_algorithm@ 	

VAR 	trigger_cause 	"cause of the trigger primitive" 	B

VAL 	@p_llgmm - VAL_trigger_cause@ 	

VAR 	error_cause 	"error cause" 	S

VAL 	@p_llgmm - VAL_error_cause@ 	

VAR 	susp_cause 	"suspension cause" 	B

VAL 	@p_llgmm - VAL_susp_cause@ 	




COMP 	llgmm_kc 	 "GPRS ciphering key"
{
 	key 	[8] 	 ; ciphering key content
}






; LLGMM_ASSIGN_REQ 	0x2100
; LLGMM_TRIGGER_REQ 	0x2101
; LLGMM_SUSPEND_REQ 	0x2102
; LLGMM_RESUME_REQ 	0x2103
; LLGMM_STATUS_IND 	0x6100
; LLGMM_TLLI_IND 	0x6101



PRIM 	LLGMM_ASSIGN_REQ 	0x2100
{
 	old_tlli 	 ; old temporary logical link entity
 	new_tlli 	 ; new temporary logical link entity
 	llgmm_kc 	 ; ciphering key
 	ciphering_algorithm 	 ; ciphering algorithm
}






PRIM 	LLGMM_TRIGGER_REQ 	0x2101
{
 	trigger_cause 	 ; trigger cause
}






PRIM 	LLGMM_SUSPEND_REQ 	0x2102
{
 	susp_cause 	 ; suspension cause
}






PRIM 	LLGMM_RESUME_REQ 	0x2103
{
}






PRIM 	LLGMM_STATUS_IND 	0x6100
{
 	error_cause 	 ; error cause
}






PRIM 	LLGMM_TLLI_IND 	0x6101
{
 	new_tlli 	 ; Newly received TLLI
}